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Here we have some word problems which can all be solved by multiplying or dividing by 10 or 100.
Use a number line to count on and back across zero.
Adding and subtracting numbers that cross the thousands boundary: often ?counting on? is the best method.
Add twenty and take one is much quicker than trying to add nineteen. But not always!
Doubling 2-digit numbers and halving 3-digit numbers mentally.
Some people like to start doubling with the units, others like to start with the tens. It doesn?t matter as long as the method is fast and accurate.
When we are multiplying by a number ending in 5 we can double the number and halve the other number before multiplying (by a multiple of ten, making it easy).
Remember to move the digits two places to the right to divide by 100.
We return to an important concept again: the relationship between multiplication and division.
Understanding and using factors of numbers can make mental multiplication easier.
What happens when a number is multiplied or divided by 10, 100 or 1 000?
Tips and hints on using a calculator, including negative numbers and recurring decimals.
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